Mixpanel coding

I am new to mixpanel and have recently launched a beta app. We outsourced the app build. I would like to know when a mixpanel developer code the events etc, does he/she need any access to the app which would require me contact the 3rd app developers? The API is already set up and we have approx. 20 events created which the 3rd party provider did. I want to create many more events.

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